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        * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the following disclaimer
    in the documentation and/or other materials provided with the
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    contributors may be used to endorse or promote products derived from
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    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <common/uri/url_canon.h>

namespace common {
namespace uri {

namespace {

#if defined(WIN32)

// Given a pointer into the spec, this copies and canonicalizes the drive
// letter and colon to the output, if one is found. If there is not a drive
// spec, it won't do anything. The index of the next character in the input
// spec is returned (after the colon when a drive spec is found, the begin
// offset if one is not).
template <typename CHAR>
int DevDoDriveSpec(const CHAR* spec, int begin, int end, CanonOutput* output) {
  // The path could be one of several things: /foo/bar, c:/foo/bar, /c:/foo,
  // (with backslashes instead of slashes as well).
  int num_slashes = CountConsecutiveSlashes(spec, begin, end);
  int after_slashes = begin + num_slashes;

  if (!DoesBeginWindowsDriveSpec(spec, after_slashes, end))
    return begin;  // Haven't consumed any characters

  // A drive spec is the start of a path, so we need to add a slash for the
  // authority terminator (typically the third slash).
  output->push_back('/');

  // DoesBeginWindowsDriveSpec will ensure that the drive letter is valid
  // and that it is followed by a colon/pipe.

  // Normalize Windows drive letters to uppercase
  if (IsAsciiLower(spec[after_slashes]))
    output->push_back(static_cast<char>(spec[after_slashes] - 'a' + 'A'));
  else
    output->push_back(static_cast<char>(spec[after_slashes]));

  // Normalize the character following it to a colon rather than pipe.
  output->push_back(':');
  return after_slashes + 2;
}

#endif  // WIN32

template <typename CHAR, typename UCHAR>
bool DoDevCanonicalizePath(const CHAR* spec, const Component& path, CanonOutput* output, Component* out_path) {
  // Copies and normalizes the "c:" at the beginning, if present.
  out_path->begin = output->length();
  int after_drive;
#if defined(WIN32)
  after_drive = DevDoDriveSpec(spec, path.begin, path.end(), output);
#else
  after_drive = path.begin;
#endif

  // Copies the rest of the path, starting from the slash following the
  // drive colon (if any, Windows only), or the first slash of the path.
  bool success = true;
  if (after_drive < path.end()) {
    // Use the regular path canonicalizer to canonicalize the rest of the
    // path. Give it a fake output component to write into. DoCanonicalizeFile
    // will compute the full path component.
    Component sub_path = MakeRange(after_drive, path.end());
    Component fake_output_path;
    success = CanonicalizePath(spec, sub_path, output, &fake_output_path);
  } else {
    // No input path, canonicalize to a slash.
    output->push_back('/');
  }

  out_path->len = output->length() - out_path->begin;
  return success;
}

template <typename CHAR, typename UCHAR>
bool DoCanonicalizeDevURL(const URLComponentSource<CHAR>& source,
                          const Parsed& parsed,
                          CharsetConverter* query_converter,
                          CanonOutput* output,
                          Parsed* new_parsed) {
  // Things we don't set in dev: URLs.
  new_parsed->username = Component();
  new_parsed->password = Component();
  new_parsed->port = Component();

  // Scheme (known, so we don't bother running it through the more
  // complicated scheme canonicalizer).
  new_parsed->scheme.begin = output->length();
  output->Append("dev://", 6);
  new_parsed->scheme.len = 3;

  // Append the host. For many dev URLs, this will be empty. For UNC, this
  // will be present.
  // TODO(brettw) This doesn't do any checking for host name validity. We
  // should probably handle validity checking of UNC hosts differently than
  // for regular IP hosts.
  bool success = CanonicalizeHost(source.host, parsed.host, output, &new_parsed->host);
  success &= DoDevCanonicalizePath<CHAR, UCHAR>(source.path, parsed.path, output, &new_parsed->path);
  CanonicalizeQuery(source.query, parsed.query, query_converter, output, &new_parsed->query);

  // Ignore failure for refs since the URL can probably still be loaded.
  CanonicalizeRef(source.ref, parsed.ref, output, &new_parsed->ref);

  return success;
}

}  // namespace

bool CanonicalizeDevURL(const char* spec,
                        int spec_len,
                        const Parsed& parsed,
                        CharsetConverter* query_converter,
                        CanonOutput* output,
                        Parsed* new_parsed) {
  UNUSED(spec_len);
  return DoCanonicalizeDevURL<char, unsigned char>(URLComponentSource<char>(spec), parsed, query_converter, output,
                                                   new_parsed);
}

bool CanonicalizeDevURL(const char16* spec,
                        int spec_len,
                        const Parsed& parsed,
                        CharsetConverter* query_converter,
                        CanonOutput* output,
                        Parsed* new_parsed) {
  UNUSED(spec_len);
  return DoCanonicalizeDevURL<char16, char16>(URLComponentSource<char16>(spec), parsed, query_converter, output,
                                              new_parsed);
}

}  // namespace uri
}  // namespace common
